How to use the all-SIN library
Refresh 32 SINs by large category
The full SIN library follows the user's Refresh 32 MAS available offerings workbook.
What this library covers
This page organizes every official SIN from the supplied Refresh 32 MAS available offerings workbook. Each child page explains the SIN title, category, subcategory, NAICS, PSC, maximum order threshold, TDR/OLM flags, and what kind of offer support usually matters.
The richer top-15 pages remain in place for the highest-signal SINs. This all-SIN layer fills in the complete official coverage so every SIN can have a stable URL.
SIN pages are a starting point, not the whole offer
A SIN tells you where an offering may fit. The actual offer still needs evidence: scope language, pricing support, catalog or service-file details, commercial support, past performance, and any SIN-specific requirements.
Use these pages to orient quickly, then verify live requirements against the current MAS solicitation, GSA templates, and contract-specific instructions.
What this looks like in practice
Search habitUse code plus plain English
The strongest search and buyer language usually pairs the SIN number with its title: 54151S Information Technology Professional Services, 561210FAC Facilities Maintenance and Management, or 518210C Cloud Computing and Cloud Related IT Professional Services.
That keeps the page helpful for both humans and search engines, and it prevents the guide library from becoming a code-only index.
Frequently asked questions
Does this include every official Refresh 32 SIN?
Yes. The library covers 277 distinct SIN rows from the supplied Refresh 32 MAS available offerings workbook. Existing richer top-15 pages are reused where they already cover a SIN.
Why do some pages feel more detailed than others?
The top-15 pages were hand-written first and are richer. The rest are source-backed generated pages so every official SIN has a stable page; priority pages can be enriched over time.